/* ================================================================
 * Cewolf : Chart enabling Web Objects Framework
 * ================================================================
 *
 * Project Info:  http://cewolf.sourceforge.net
 * Project Lead:  Guido Laures (guido@laures.de);
 *
 * (C) Copyright 2002, by Guido Laures
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package de.laures.cewolf.taglib.tags;

import javax.servlet.jsp.JspException;

import de.laures.cewolf.DatasetProducer;
import de.laures.cewolf.taglib.DataAware;

/** 
 * Tag &lt;producer&gt; which defines a DatasetProducer.
 * @see DataTag
 * @author  Guido Laures 
 */
public class ProducerTag extends AbstractParameterizedObjectTag {

	static final long serialVersionUID = 1193241004439087455L;

	private boolean useCache = true;

	public int doEndTag() throws JspException {
		DatasetProducer dataProducer = null;
		try {
			dataProducer = (DatasetProducer) getObject();
			if (dataProducer == null) {
				throw new JspException("Could not find datasetproducer under ID '" + getId() + "'");
			}
			dataProducer.setSession(pageContext.getSession());
		}
		catch (ClassCastException cce) {
			throw new JspException("Bean under ID '" + getId() + "' is of type '"
					+ getObject().getClass().getName() + "'.\nType expected:"
					+ DatasetProducer.class.getName());
		}
		DataAware dw = (DataAware) findAncestorWithClass(this, DataAware.class);
		addParameter(DatasetProducer.PRODUCER_ATTRIBUTE_NAME, getId());
		dw.setDataProductionConfig(dataProducer, getParameters(), useCache);
		return doAfterEndTag(EVAL_BODY_INCLUDE);
	}

	/**
	 * Sets the useCache.
	 * @param useCache The useCache to set
	 */
	public void setUsecache(boolean useCache) {
		this.useCache = useCache;
	}

}
